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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

No reliable study is present for magnesium sulphate. Based on a reliable study with ammonium sulphate and the results being confirmed by studies with potassium and magnesium sulphate, the EC50 for freshwater algae is determined to be 2700 mg/L and the NOEC is ≥ 100 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
2 700 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

No reliable algae study with magnesium sulphate is present. However, a supporting study showed an EC50 >100 mg/L. In addition, several limited documented studies showing high EC50 values for potassium sulphate are present. Also limited documented studies with magnesium sulphate are present, also showing a high EC50. However, in the sulfate category a reliable study with ammonium sulphate is present. This static 18-day test with Chlorella vulgaris showed an 18-d EC50 of 2700 mg/L based on cell number. As no extrapolation was possible to an EC10, the NOEC is considered to be at least 100 mg/L.